- No lights on controller
- Does not respond to charge
- No key/button combinations seem to make it work
The DJI Phantom controllers (Phantom 3, Phantom 3 Advanced, and reportedly some Phantom 4's) seem to have a problem with their batteries where they refuse to charge. If the controller doesnt respond to charge or the power button, it is likely your battery is experiencing this issue. (Scroll down to "Getting the lights to turn on" first before replacing the battery)
If your Phantom is under warranty (within 1? year of purchase and can provide proof), open a case with support, they'll have you ship the controller back and in about 1-2 months, you'll get it back with a new battery.